应用化学 ›› 2024, Vol. 41 ›› Issue (1): 137-146.DOI: 10.19894/j.issn.1000-0518.230083

• 研究论文 • 上一篇    下一篇

基于上转换信标探针构建信号放大近红外激发荧光生物传感器用于microRNA检测

周学敏1, 吕姝臻2, 张国芳1, 崔竹梅1(), 毕赛2()   

  1. 1.青岛大学附属医院,青岛 266061
    2.青岛大学化学化工学院,青岛 266071
  • 收稿日期:2023-03-31 接受日期:2023-05-31 出版日期:2024-01-01 发布日期:2024-01-30
  • 通讯作者: 崔竹梅,毕赛
  • 基金资助:
    北京康华中西医发展基金会项目(KH-2021-LLZX-014);国家自然科学基金(22076087);山东省杰出青年基金(ZR2020JQ08)

A Near-Infrared-Driven Signal Amplification Fluorescence Biosensor Based on Upconversion Beacon Probe for microRNA Detection

Xue-Min ZHOU1, Shu-Zhen LYU2, Guo-Fang ZHANG1, Zhu-Mei CUI1(), Sai BI2()   

  1. 1.The Affiliated Hospital of Qingdao University,Qingdao 266061,China
    2.College of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,China
  • Received:2023-03-31 Accepted:2023-05-31 Published:2024-01-01 Online:2024-01-30
  • Contact: Zhu-Mei CUI,Sai BI
  • About author:bisai11@126.com
    cuizhumei1966@126.com
  • Supported by:
    the Beijing Kanghua Foundation for the Development of Traditional Chinese and Western Medicine(KH-2021-LLZX-014);the National Natural Science Foundation of China(22076087);the Natural Science Fund for Distinguished Young Scholars of Shandong Province(ZR2020JQ08)

摘要:

基于NaYF4∶Yb3+,Tm3+@NaYF4上转换纳米颗粒(Upconversion nanoparticles, UCNPs)和DNA催化发夹组装(Catalytic hairpin reaction, CHA)技术构建近红外激发(Near-infrared, NIR)荧光生物传感器,用于microRNA的高灵敏分析。靶标microRNA-21(miRNA-21)可与磁珠(Magnetic beads, MBs)表面修饰的发夹H1发生toehold区域介导的链取代反应,发夹H1暴露新的toehold区域与UCNPs表面修饰的发夹H2发生反应,形成H1/H2复合物,同时miRNA-21被取代并与新的发夹H1反应,此过程将UCNPs固定于MBs表面,而且实现了信号的循环放大。接下来通过磁分离技术,将固定于MBs表面的UCNPs分离出来,在808 nm NIR的激发下产生上转换发光(Upconversion luminescence, UCL),对miRNA-21的检测范围为0.1~100 nmol/L,检出限为11.3 pmol/L。此外,该荧光生物传感器成功应用于血清样本中miRNA-21的分析,表明其具有良好的实用性。

关键词: 上转换纳米颗粒, 催化发夹组装, 荧光生物传感器, microRNA, 近红外光

Abstract:

In this work, a near-infrared light (NIR)-driven fluorescence biosensor is proposed based on the upconversion beacon probe and catalytic hairpin reaction (CHA) for the detection of microRNA. The target microRNA-21 (miRNA-21) can trigger the CHA reaction between the DNA hairpin H1 modified on magnetic beads (MBs) and the DNA hairpin H2 modified on upconversion nanoparticles (UCNPs), resulting in the introduction of UCNPs on the surface of MBs accompanied by the cyclic signal amplification. Through magnetic separation, the UCNPs fixed on MBs are separated and generate upconversion luminescence (UCL) under the excitation of 808 nm NIR, which shows the advantages of good luminescence stability and negligible photodamage. In this biosensor, the linear range of miRNA-21 is 0.1 to 100 nmol/L with the detection limit of 11.3 pmol/L. In addition, this fluorescence biosensor achieves the detection of miRNA-21 in serum samples, showing good practicability.

Key words: Upconversion nanoparticles, Catalytic hairpin reaction, Fluorescence biosensor, MicroRNA, Near-infrared light

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